—Mary told me she would ________ computer studies.
—Really? I’ll try my best to ask her to_________ such foolish ideas.
| A．pick up; give up | B．put away; give up |
| C．give up; put away | D．give up; pick up |
Before the conference, a new problem came up __________ could speak on behalf of our group.
| A．that | B．who | C．which | D．how |
He dressed up and went to the party as if ___________.
| A．was invited | B．had been invited | C．invited | D．to be invited |
Scientist are not sure about the ___________ of water on the Mars.
| A．occupation | B．existence | C．demand | D．treasure |
Don’t push me! __________ you know the truth right away?
| A．Must | B．Could | C．Might | D．Would |
. He __________ full marks, but he was so careless as to make a spelling mistake.
| A．must have gained | B．can have gained | C．could have gained | D．must gain |